Procedure and contrivance for firmly attaching a metal case with a nipple adjusted in the same



Dec. 6, 1927. I w 1,652,073

R. VONTOBEL PROCEDURE AND CONTRIVANCE FOR FIRMLY ATTACHING A METAL CASEWITH A NIPPLE ADJUSTED IN THE SAME Filed De0.-l0. 1926 V the one end ofthe case or tube 3 and is to be In apparatus for drawing tubes onto nip-Patented Dec. 6, 1927., c g i 7 1 52 073 vmural) STATESPATENT OFFICE.

ROBERT VONTOBEL, 0F KILCHBERG, NEARZURICH, SWITZERLAND.

PROCEDURE AND cournIv NoE FOR FIRMLYY ATTACHI'NG A METAL CAS WITH ANIPPLE ADJUSTED IN THE SAME.

Application filed December 10, 1926, Serial No. 154,317, and in. GermanyAugust 3, 1925.

This invention refers to a procedure and a plier or drawing tool, sothat these are contrivance for the firm attachment of a are pressedagainst the case or tube 3, wheremetal tube or case with a nipplepositioned by the case 3 is held immovably fast by the in the same. Ichuck, whilst the pliers or drawing tool is 6 The procedure, accordingto the invention, thrust or bites as far into the case 3 until consistsin subjecting the metal tube or case to the caliper parts 4, 4t, 4 touchone another the action of a tightening or drawing opera- (Fig. 4).Thereupon the pliers 2 with their tion at the place where the metal casegrasps case 6 move in the direction of the arrow the nipple. (Fig. 2)till the tightening process is com- 1 The drawing shows an example ofthe pleted. The diameter of the end of the case manner in which theprocedure is carried out. 3 is reduced as the plier or drawing head isFigure 1 shows a longitudinal section of pulled to the extreme end'ofthe case 3. In

. the plier or drawing tool at the commen'ceso doing the metal ofthecase 3 flows in the ment of the securing process for obtaining directionof pull and covers the slightly pro- 15 the connection of a metal casewith a nipple; tru'ding end on the nipple 8. Only that por- Fig. 2 showsthe position of the plier or tion 'of the case surrounding the nipple isdrawing tool during the tightening process reduced'and drawn. In Fig. 3the executory (longitudinal section); Fig. 3 shows turnexample of thisprocess is a turnbuckle.

V buckle, in longitudinal section, made by this This turnbucklecomprises the case or tube process, in which the nipple is secured inthe 3 having. nipples 8 secured in the ends by case by reducing the casediameter by a having the end portions of the case or tube drawingoperation. The nipple is provided drawn onto them, in the manner abovedewith an inner thread. Fig. t is a transverse scribed',the metal of thetube or case being section on line aa of Fig. 1 'seen from the reducedin diameterand caused to flow to the 25 left. ends of the nipples as ata. K

1 are the chuck jaws, three jaws ibeing The pliers or drawing toolmayhave more used, and 2 are the plier or drawing dies than three jaws,if desired. similar in number, whose extremities L, 4", The bore of thenipple 8 may be of any 4" grasping the case or tube have external shape,either cylindrical with or without 7 conical faces. These conical facescooperate thread, or prismatic, conical or pyramidal. with correspondingor complementary cones The exterior surface of the nipple may be 5. 5 ofthe casings 6, 6 of the caliper or smooth or rough, or provided withgrooves, chuck and pliers or drawing tool respecfiat cuts or ascrew-thread. tively: 8 is the nipple, which is placed into Iclaimfirmly connected with the same by tightening ples, a tubular 'dieholder having an internal or drawing a portion of the tube. As seen inconical face with its smaller end toward one Fig. 1 the calipers orchuck and the pliers or end of the holder and a plurality of die drawingtool at the commencement of the members forming a die therein and havingprocess are in the complementary cones 5, 5 external faces complementaryto the conical of the cases or bodies 6, 6 and somewhat face in theholder, said members adapted to withdrawn into the same. slide on theconical face of the holder to As soon as the tightening process begins,constrict the die opening.

the cases or bodies containing the comple- In testimony that I claim theforegoing as 45 mentary-cones of the cases are drawn back my invention,I have signed mgIname.

over the cones of the caliper or chuck and ROBERT VO TOBEL.

